Suction filter



Patented duly 39, 1929.

narran stares @EGBGB H. D 5,

, 01E" NORWOOD, RHODE ISLN.

Application led March 6, 1928. Serial No. 259,444.

My invention relates to suction filters of the porous type. y

The essential objects of my inven-l tion are to subject the entireporous wall l'distribute the suction throughout its entire length,whereby the clogging of the pores `is materially delayed; to lessen theamount of vacuum required to be produced by the pump or other suctionapparatus; to prevent the clogging of the inlets of the suction pipe; toprevent entrance of the sand through the suction pipe into the suctiondevice; to enable the facile substitution of any broken part of thefilter; to facilitate the assembla e of the filter parts; and to attainthese en s in a simple and inexpensive manner.

To the above ends essentially my invention consists in such parts and insuch combinations of parts as fall'within the scope of the appendedclaims.

In the accompanying drawings which form a part of this specificationFigure l is a plan view of my filter,

Figure 2, a vertical section of the same,

Figure 3, a transverse section on line 3-3 of Figure 2, and v Figure 4,a sectional view of a well or cistern shown in side elevation with mydevice mounted therein.

My filter in its preferred embodiment comprises a cylindrical side 7 ofany well known porous material suitable for this purpose, such as ahardened mixture of sand and cement. The wall is of substantialthickness with smooth end faces.

A circular metallic base plate 9 of a diamter equal to that of theexterior of the side has a peripheral upturned flange 10 adapted toembrace the lower end of the side 7. The base in this instance has acentral cylindrical projection l2 integral with its upper faceregistering in the lower end of a section 13 of the suction pipe, towhich projection the section is united by welding or otherwise so as toinsure a rigid connection. The pipe section is provided at its upper endwith an external thread 14 and near its bottom end with diametricallyoppositely 5o disposed inlet openings l5. Integral with the base 9 is asubstantially cylindrical baffie plate 17 concentric with the suctionpipe section 13 and spaced from both the latter and the side 7. Itsexterior face is preferably slightly tapering upwardly and inward- .i ofthe filter to suction, and to evenly`\section 13 or the side 7.

l embrace the latter.

ly presenting a slightly trunco conical appearance, as at 18. It isessential for the best results that the height of the bae plate notextend above half the height of the pipe A circular metallic top plate20 adapted to rest upon the top face of the side 7 has a dependingperipheral flange 21 adapted to Upon the central portion of its upperface the plate 20 has a po- 65 lygonal elevation or integral nut portion23 to accommodate a wrench. rIhe center of this plate and elevation isprovided with a hole 24 having an internal thread 25 adaptto engage thethread 14 upon the pipe sec- 70 tion 13.

In assembling the described parts into a complete suction filter 27 theside 7 is placed upon the base plate 9. The combined top and clampingplate is next applied to the pipe section 13 above the side-7 and, by awrench applied to the elevation 23, screwed tightly down, therebyclamping the three members into secure interengagement. When thusclamped it will be found that 30 there results a large closedcylindrical central chamber 29 divided in its lower portion by thebaffle plate into two substantially annular sub chambers 30 and 31,exterior and interior respectively of the baille plate.

After the filter has been assembled as above described it may beconnected with a longer suction pipe section 33 by a coupling sleeve 35or otherwise. The pipe section 33 is herein shown connected with asuction mechanism or device 37 which is in this instance a pump. Thefilter depends in this instance near the bottom of a well or cistern 39closed by a cover 40 which supports the pump.

In operation the water is, by suction through the pipe 13, drawn fromthe exterior of the filter with even force through the side 7 from topto bottom, as indicated by the arrows, and thence down through the subchamber 31 and the openings 15 into the pipe section, and upwardlytherethrough. rI'he prolongation of the baffle plate to a pointapproximately midway the height of the filter is to increase theresistance'to the ingress of water as the bottom of the filter isapproached to correspond with the increase of pressure, with the resultthat the ingress of Water through the porous side of the filter isdistributed more evenly throughout the length thereof. The presence ofthe abutment is found to lessen the amount of vacuum required to beproduced by the suction device, and lessening the vacuum also results incausing any incoming sand from the filter side to more readily fall intothe sub chamber 30 instead of into the chamber 31. The baile plate bythus walling oli' any incoming sediment not only causes it to bedeposited in the chamber 30 but thereby prevents its clogging theopenings yl5 or ultimately entering and injuring the pump.

It will be noted that the utilization of the top plate 20 as a clamaffords a facile means of assembling and isassembling the constituentparts of the filter for the removal of sand accumulation or replacingbroken parts.

It will be further noted that the rigid connection of the suction pipe13 with the bottom plate stidens the entire filter structure to aremarkable degree.

Furthermore the parts of the structure are reduced to a minimum.

I claim: y

1. In a suction filter, a base plate, a tubular porous side upon theplate, a suction pipe ixed at its lower end to the center of the plateconcentric with the side and provided with inlets near its lower end, abaille plate upon the base plate surrounding the pipe and spaced fromthe pipe and side and extended up a large portion of the height of thefilter wall, and a plate upon the top of the side engaging the pipe.

2. In a suction lilter, a base plate, a suction pipe fixed at one end tothe center of the base provided with inlets, a tubular porous sidevresting uponwthe plate exterior of the pipe, a baille plate integralwith the base plate between the pipe and side and ex- .tended up a largeportion 'of the height tially cylindrical bale plate integral with thebase plate and extended' up a large portion of the height of the filterwall, a clamping plate resting upon the side, and provided with acentral hole to receive the pipe therethrou h and with a thread in thehole engaging 51e thread yupon the pipe.

4. A suction filter comprising a base plate, a top plate, the base platehaving rigid' therewith an upwardly extending baille late and extendedup a large portion' -o the height of the filter wall, a poroussurrounding wall, a suction pipe extended upward beyond the baiile plateand communicating near its lower end with the space enclosed by saidbafile plate, a top plate through which the upper end of the suctionpipe eX- tends, the lower endv of said pipe being mounted within thespace enclosed by the baille plate, and a detachable connection betweenthe upper end of the pipe and top ate. p In testimony whereof I haveaiixed my signature.

GEORGE H. DEAN.

